<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8" />
  <meta http-equiv="X-UA-Compatible" content="IE=edge" />
  <meta name="viewport" content="width=device-width, initial-scale=1.0" />
  <link rel="stylesheet" href="./css/inputnumber.css" />
  <link rel="stylesheet" href="./css/index.css" />
  <title>购物车</title>
</head>

<body>
  <div class="app-container" id="app">
    <!-- 顶部banner -->
    <div class="banner-box"><img src="./img/fruit.jpg" alt="" /></div>
    <!-- 面包屑 -->
    <div class="breadcrumb">
      <span>🏠</span>
      /
      <span>购物车</span>
    </div>
    <!-- 购物车主体 -->
    <div class="main" v-if="fruitList.length>0">
      <div class="table">
        <!-- 头部 -->
        <div class="thead">
          <div class="tr">
            <div class="th">选中</div>
            <div class="th th-pic">图片</div>
            <div class="th">单价</div>
            <div class="th num-th">个数</div>
            <div class="th">小计</div>
            <div class="th">操作</div>
          </div>
        </div>
        <!-- 身体 -->
        <div class="tbody">

          <div class="tr" v-for="(item, index) in fruitList" :key="item.id" :class="{active:item.isChecked}">
            <div class="td"><input type="checkbox" v-model="item.isChecked" /></div>
            <div class="td"><img :src="item.icon" alt="" /></div>
            <div class="td">{{item.price}}</div>
            <div class="td">
              <div class="my-input-number">
                <button class="decrease" @click="minus(item)"> - </button>
                <span class="my-input__inner">{{item.num}}</span>
                <button class="increase" @click="add(item)"> + </button>
              </div>
            </div>
            <div class="td">{{item.num*item.price}}</div>
            <div class="td" @click="del(item.id)"><button>删除</button></div>
          </div>


        </div>
      </div>
      <!-- 底部 -->
      <div class="bottom">
        <!-- 全选 -->
        <label class="check-all">
          <input type="checkbox" v-model="isCheckedAll" />
          全选
        </label>
        <div class="right-box">
          <!-- 所有商品总价 -->
          <span class="price-box">总价&nbsp;&nbsp;:&nbsp;&nbsp;¥&nbsp;<span class="price">{{totalPrice}}</span></span>
          <!-- 结算按钮 -->
          <button class="pay">结算( {{totalNum}} )</button>
        </div>
      </div>
    </div>
    <!-- 空车 -->
    <div class="empty" v-else>🛒空空如也</div>
  </div>
  <!-- <script src="https://cdn.jsdelivr.net/npm/vue@2/dist/vue.js"></script> -->
  <script src="../day1/vue.js"></script>
  <script>
    const defaultArr = [{
      id: 1,
      icon: './img/火龙果.png',
      isChecked: true,
      num: 2,
      price: 6,
    },
    {
      id: 2,
      icon: './img/荔枝.png',
      isChecked: false,
      num: 7,
      price: 20,
    },
    {
      id: 3,
      icon: './img/榴莲.png',
      isChecked: false,
      num: 3,
      price: 40,
    },
    {
      id: 4,
      icon: './img/鸭梨.png',
      isChecked: true,
      num: 10,
      price: 3,
    },
    {
      id: 5,
      icon: './img/樱桃.png',
      isChecked: false,
      num: 20,
      price: 34,
    },]
    const app = new Vue({
      el: '#app',
      data: {
        // 水果列表
        fruitList: JSON.parse(localStorage.getItem('list')) || defaultArr,
      },
      methods: {
        // 点击按钮的"+"-"
        del(id) {
          this.fruitList = this.fruitList.filter(item => item.id !== id)
        },
        add(item) {
          item.num += 1
        },
        minus(item) {
          if (item.num > 1) {
            item.num -= 1
          }
        }
      },
      computed: {
        isCheckedAll: {
          get() {
            // console.log(this.fruitList.map(item => item.isChecked)); // 打印每个商品的选中状态
            return this.fruitList.every(item => item.isChecked)
          },
          set(value) {
            this.fruitList.forEach(item => item.isChecked = value)
          }
        },
        // 获取总价和结算按钮的商品种类数量
        // getTotal() {
        //   return this.fruitList.reduce((sum, item) => sum + (item.isChecked ? item.num * item.price : 0), 0)
        // },
        // setTotal() {
        //   return this.fruitList.filter(item => item.isChecked).length
        // }
        // 过滤出选中的列表(做缓存)
        checkedList() {
          return this.fruitList.filter(item => item.isChecked)
        },

        totalPrice() {
          return this.checkedList.reduce((pre, cur) => pre + cur.num * cur.price, 0)  // 累加价格
        },
        totalNum() {
          return this.checkedList.reduce((pre, cur) => pre + cur.num, 0) // 累加数量
        }
      },
      watch: {
        fruitList: {
          deep: true,
          handler(newValue) {
            // 将变化后的newValue保存到本地存储中
            localStorage.setItem('list', JSON.stringify(newValue))
          }
        }
      }


    })
  </script>
</body>

</html>